[schema] specify draft7 json schema

Also bumps the jsonschema version requirement

beat/core/schema/__init__.py

@@ -105,7 +105,7 @@ def load_schema(schema_name, version=1):
     resolver = jsonschema.RefResolver("file://" + basedir + "/", schema)
 
     # now we load it
-    return jsonschema.Draft4Validator(schema, resolver=resolver)
+    return jsonschema.Draft7Validator(schema, resolver=resolver)
 
 
 def validate(schema_name, data):

conda/meta.yaml

@@ -31,7 +31,7 @@ requirements:
     - docker-py
     - docopt
     - python-graphviz
-    - jsonschema
+    - jsonschema >=3.0.0
     - numpy
     - pip
     - pyzmq

requirements.txt

@@ -2,7 +2,7 @@ beat.backend.python>=1.6.0a0
 docker
 docopt
 graphviz
-jsonschema
+jsonschema>=3.0.0
 numpy
 pip
 pyzmq